The Espar Hydronic L-II coolant heater is the partner you need to keep you warm and productive. The Hydronic L-II series are for the largest coaches, boats, and off-road engines and are easily OEM installed or retrofitted. These heaters provide engine, fuel,  and hydraulic preheat in addition to providing main or supplemental heat. They’re the first choice for rapid heating in “arctic-like” conditions. The diesel-fired Hydronic L-II Series puts out 54,630 to 120,000 BTU of clean heat to keep you warm and comfortable, no matter the weather or season. Available in a wide range of thermal outputs to closely match your heating needs, Espar heaters are compact, convenient and economical to operate. A Hydronic water or coolant heater offers full internal heat control, supplemental cabin heating, and domestic hot water facilities, while consuming minimal amounts of electrical power and fuel.

Hydronic L-II Series Heater Benefits:

• Produces 54,630 to 120,000 BTU/hour of heat output
  
• High efficiency with the option of four power levels
  
• Low fuel and power consumption
• Eliminates electrical plug-ins
• Easy to install and maintain
  
• Constant function monitoring
• Safety and diagnostic system
  
• EPA verified/CARB compliant for use anywhere in North America

Hydronic L-II Series Heater Applications:

• Trucks
• Vans/Campervans
• R/V's
• Buses
• Boats (requires a marine heater kit)

*Note this is only the heater unit. For a new installation or replacement of an older heater, additional parts may be needed. Refer to our general hydronic heater kit list for details. Contact us at 206-548-1306 for more information.

Use the guide below to help you determine what heater you need for your boat.